Rotatable infusion set

ABSTRACT

An arrangement for introducing a liquid into the body of a patient or for withdrawing a liquid from the body of a patient, including a first structural part carrying a cannula for positioning in the body of the patient, and a second structural part with a connection port for detachably coupling a conduit for supplying or withdrawing a liquid, wherein the first and second structural parts are connected, can be rotated relative to each another and in relative rotational positions form a channel for introducing a liquid from the conduit to the cannula or for withdrawing a liquid from the cannula to the conduit, and whereby movement of the conduit for coupling and uncoupling is transverse to the longitudinal axis of the cannula.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Patent ApplicationNo. PCT/CH2007/000074, filed on Feb. 13, 2007, which claims priority toSwiss Application No. 911/06, filed on Jun. 7, 2006, the entire contentsof both of which are incorporated herein by reference.

BACKGROUND

The present invention relates to devices for infusing, delivering,administering, injecting or dispensing a substance, and to methods ofmaking and using such devices. More particularly, it relates to anarrangement for introducing a liquid into the body of a patient or forwithdrawing a liquid from the body of a patient and use of thearrangement for subcutaneous supplying of a liquid medicament into thebody of a patient.

In those patients who have an ongoing need for medicaments ortherapeutic agents to be administered by direct supply to the bodytissue or the blood stream, or in whom body fluid samples for monitoringcertain parameters, such as e.g. blood sugar, need to be taken from thebody over a longer period, it is meaningful to undertake supply of themedicament or withdrawal of the body fluid via a cannula introduced at asuitable site into the body and remaining there over a longer period.

For example, these days, in many patients with type I and type IIdiabetes, the required quantity of insulin is supplied to the bodycontinuously or at short intervals. This may be accomplished, in manyinstances, using a cannula inserted through the skin into thesubcutaneous tissue of the patient, which is part of an arrangementattached to the body of the patient and often designated as an “infusionset.” The insulin supplied is controlled by an automated insulin pump.The connection between insulin pump and infusion set is made by aflexible supply conduit which is coupled detachably to the infusion setby a connector. Since the infusion set is worn practically permanentlyon the body, good wearer comfort is important. For this reason, theinfusion set is built as flat as possible, including with a supplyconduit connected, and the freedom of movement of the patient isimpaired to the least extent possible. In addition, it is important thatthe coupling and uncoupling of the supply conduit can be done easily andsecurely and operating errors are excluded as early as possible by theconstructive configuration of the infusion set. Similar marginalconditions and requirements will emerge when body fluid samples aretaken from the body of a patient over a longer period.

Documents WO 02/070037 A2, DE 299 05 068 U1, U.S. Pat. No. 6,923,791 B2,WO 2005/049117 A2, US 2005/0101910 A1 and WO 2004/026375 A1 discloseinfusion devices in which the supply conduit with an adapter part in anaxial direction of the cannula can be set on the part of the devicebearing the cannula and can be removed again from the latter in theopposite direction. The cannula in the infusion devices disclosed in WO02/070037 A2, U.S. Pat. No. 6,923,791 B2, WO 2005/049117 A2, US2005/0101910 A1 and WO 2004/026375 A1 are provided for substantiallyvertical insertion into the body of the patient, whereby the supplyconduit is led away from the adapter part in a direction vertical to thedirection of setting. The device disclosed in DE 299 05 068 U1 isprovided for inserting into the body of a patient at a flat angle,whereby the supply conduit is led away from the adapter part in thedirection of setting. After being set on the part bearing the cannula,the adapter part in the devices according to WO 02/070037 A2, DE 299 05068 U1, U.S. Pat. No. 6,923,791 B2, WO 2005/049117 A2, US 2005/0101910A1 is rotatable relative to the part bearing the cannula, while in thedevice disclosed in WO 2004/026375 A1 it is latched in rotatoryalignment selected for setting on with respect to the part bearing thecannula.

A disadvantage of known devices is that the adapter for uncoupling thesupply conduit from the infusion set in the axial direction of thecannula is removed from the infusion set, whereby there is a notinsubstantial danger that the cannula may be withdrawn from theinjection site unnoticed fully or partially, resulting in no delivery orinadequate delivery of liquid medicament into the tissue.

A further disadvantage of the infusion devices disclosed in WO 02/070037A2, U.S. Pat. No. 6,923,791 B2, WO 2005/049117 A2, US 2005/0101910 A1and WO 2004/026375 A1 is that, in the applied state with the supplyconduit coupled, they have a relatively high structure. An addeddisadvantage of the device disclosed in DE 299 05 068 U1 is that afterapplication of the part bearing the cannula on the body of a patientthere is no further possibility of altering the direction in which thesupply conduit leads away from the infusion device.

SUMMARY

An object of the present invention, therefore, is to provide anarrangement for introducing a liquid into the body of a patient or forwithdrawing a liquid from the body of a patient, which does not have thedisadvantages of the prior art or at least partially avoids these.

In one embodiment, the present invention comprises an arrangement forintroducing a liquid into the body of a patient or for withdrawing aliquid from the body of a patient, including a first structural partcarrying a cannula for positioning in the body of the patient, and asecond structural part with a connection port for detachably coupling aconduit for supplying or withdrawing a liquid, wherein the first andsecond structural parts are connected, can be rotated relative to eachanother and, in relative rotational positions, form a channel forintroducing a liquid from the conduit to the cannula or for withdrawinga liquid from the cannula to the conduit, and wherein movement of theconduit for coupling and uncoupling is transverse to the longitudinalaxis of the cannula.

In one embodiment, the present invention comprises an arrangement forintroducing a liquid to the body of a patient or for withdrawing aliquid from the body of a patient, comprising a first structural partwith a cannula protruding from this for arrangement in the body of thepatient; a second structural part with a connection port for detachablecoupling of a corresponding connector of a conduit for supplying orwithdrawing a liquid, wherein the first structural part and the secondstructural part are configured and connected to one another such thatthey are inseparable and can be rotated relative to one another and inevery relative position form a channel for introducing a liquid from theconnection port to the cannula or for withdrawing a liquid from thecannula to the connection port, and wherein the connection port of thesecond structural part is designed such that the coupling and uncouplingof a corresponding connector takes place in each case in a directiontransverse to the longitudinal axis of the cannula.

In one embodiment, the present invention comprises an arrangement forintroducing a liquid into the body of a patient or respectively forwithdrawing a liquid from the body of a patient comprising a firststructural part which bears a projecting cannula provided forpositioning in the body of a patient after it is inserted in through theskin. The arrangement of the present invention further comprises asecond structural part which forms a connection port for detachablecoupling of a corresponding connector of a conduit for delivering orwithdrawing a liquid. “Corresponding” connector is understood here as aconnecting element adapted to complement the connection port, such thatthe connection port and the connector together form a secure andrepeatedly detachable and reconnectable coupling site for the liquidconduit in the form of a matching plug and socket connection. The firststructural part and the second structural part of the inventivearrangement are configured and connected to one another such that theyare inseparable and can be rotated about an axis of rotation relative toone another. The first and the second structural part, in each relativeposition which they can take up relative to one another, form a channelsealed to the outside between the connection port and the cannula, viawhich a liquid can be delivered from the connection port to the cannulaor from the cannula to the connection port. The connection port is inthis case configured and associated with the second structural part suchthat the coupling and uncoupling of a corresponding connector of aconduit is possible exclusively in a direction transverse to thelongitudinal axis of the cannula.

The present invention enables manufacture of arrangements forintroducing a liquid into the body of a patient or respectively forwithdrawing a liquid from the body of a patient which offer a highdegree of wearer comfort along with good security against operatingerrors.

In one preferred embodiment of the arrangement of the present invention,the connection port of the second structural part of the arrangement isconfigured such that the coupling and uncoupling of a correspondingconnector in each case must take place vertically to the longitudinalaxis of the cannula. This provides maximal security againstunintentional withdrawal of the cannula when the connector is beinguncoupled.

In yet another preferred embodiment of the arrangement of the presentinvention, the first and the second structural part can be rotatedrelative to one another about an axis of rotation extending parallel tothe longitudinal axis of the cannula. Thus, a simple construction can berealized, e.g. whenever the cannula is provided for vertical insertioninto a body, which may be preferred.

In yet another preferred embodiment of the arrangement in accordancewith the present invention, the cannula projects vertically ornon-vertically from a substantially even or flat outside surface of thefirst structural part, whereby in both cases the first and the secondstructural part can be rotated relative to one another about an axis ofrotation standing vertically to the outside surface. The advantage ofthis is that the rotation plane of the second structural part oncompletion of application of the arrangement extends parallel to thebody surface, so that a substantially identical application situationarises from every rotatory relative position between the first and thesecond structural part.

In yet another preferred embodiment of the arrangement in accordancewith the present invention, the first and the second structural part canbe rotated through 360°, e.g. endlessly rotatably about one another, orcan be rotated by less than 360° to one another, i.e. not endlesslyrotatably about one another. Depending on the application or intendeduse, one or the other variant can be advantageous, whereby thefirst-mentioned variant has the advantage that the second structuralpart can be arranged in every position and that with first and secondstructural parts endlessly rotatable about one another and correspondingconfiguration of the arrangement, rotation of the second structural partcan occur in any other relative position in any direction of rotation.An advantage of the latter variant, for example, is that unwanted“coiling” of the conduit is not possible with use as intended connectedto the arrangement as a result of repeated rotation of the secondstructural part relative to the first structural part.

In yet another preferred embodiment, the connection between the firstand the second structural part is configured such that a specific torquemust be overcome for counterrotation of both structural parts relativeto one another, e.g. a torque in the range between 0.01 and 0.05 Nm orin the range between 0.01 and 0.1 Nm. In some preferred embodiments, apre-tensed elastic structural part is available to generate the torqueto be overcome, which produces friction between the first and the secondstructural part. Exemplary suitable structural parts are a pre-tensedelastic seal, such as an O-ring seal, and/or a ratchet arrangement.

The advantage of such embodiments is that unnecessary rotating, causede.g. by a change in position of the person wearing the arrangement withrespect to the direction of gravity, of both structural parts relativeto one another can be prevented, whereby the previously mentioned dangerof “coiling” of a liquid conduit coupled to the arrangement is reduced.Retrieval of the connection port after momentary uncoupling of theconnector of the connection conduit from the arrangement is alsoimproved, since the second structural part, in the absence of forcesbearing thereon, remains in the position assumed during uncouplingrelative to the first structural part.

In yet another preferred embodiment, an arrangement in accordance withthe present invention comprises a detent means, e.g., a latch or lock,configured for releasably preventing or overriding the twisting capacity(or turning or rotation) of the first and second structural partrelative to one another by latching them in a specific position relativeto one another.

In some preferred embodiments, the detent means is configured such thatthe first and the second structural part are latched automatically in aposition relative to one another. This may be the case if, for example,no corresponding connector of a conduit is coupled to the connectionport of the second structural part. In some embodiments, both structuralparts are latched during uncoupling of the connector. In someembodiments, the latching can be cancelled by coupling of acorresponding connector to the connection port, e.g. by a latchingelement of the latching device being moved by the connector into anon-latched position. Such configuration guarantees easy retrieval ofthe connection port following momentary uncoupling of the connector fromthe arrangement, since the second structural part remains in itsrelative position assumed during uncoupling.

In some preferred embodiments, the detent means is configured such thatthe first and second structural part are latched or are being latched ina position relative to one another if a corresponding connector of aconduit is coupled or is being coupled to the connection port of thesecond structural part. Such latching can be cancelled by uncoupling ofthe connector from the connection port so that there is no latching whenthe connector is uncoupled. This variant can be advantageous in theevent where a selected relative position is to be adhered to in thenormal case, e.g. for preventing coiling of the conduit.

In some preferred embodiments, the detent means is configured such thatit can be activated and/or deactivated via one or more actuationelements, and, in some embodiments, it may be preferred that the detentmeans are latched without actuation of the actuation elements. Becauseof this there is easy retrieval of the connection port followingmomentary uncoupling of the connector from the arrangement and “coiling”of the coupled conduit is securely prevented. According to one preferredsubvariant of the present invention, the detent means can be selectivelyactivated or deactivated via the actuation elements such that, in eachstate, twisting between the first and the second structural part can bepermitted or prohibited.

In embodiments of the arrangement fitted with detent means, the detentmeans is configured such that latching can take place positively indiscrete positions or frictionally in any position. Depending on use andconfiguration, one or the other of these variants may be preferred.

In yet another preferred embodiment of the arrangement of the presentinvention, the cannula is designed as a flexible cannula, wherein it ispenetrated by a guide needle removable after application by insertion toenable insertion into the tissue of a patient in its cannula channel.Such so-called soft cannulas are well-suited for remaining longer in thesubcutaneous tissue of a patient, since they cause almost no irritationsin the vicinity of the injection site.

In yet another preferred embodiment of the arrangement of the presentinvention, the outside surface of the first structural part from whichthe cannula protrudes extends bears an adhesive layer advantageouslyformed by plaster for fastening the first structural part by adhesion onthe skin of a patient. The adhesive layer is covered by a protectivefilm which is removed shortly prior to application or use of thearrangement. Such an adhesive layer allows the arrangement to beattached securely and comfortably on the skin of the patient duringapplication.

In yet another preferred embodiment, the arrangement additionallycomprises a connector for coupling a conduit for delivering or forwithdrawing a liquid.

One aspect of the present invention relates to use of the arrangement ofthe present invention for subcutaneous supplying of a liquid medicament,e.g. for subcutaneous supplying of insulin, into the body of a patient.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a perspective plan view of an embodiment of an arrangement inaccordance with the present invention with a supply conduit connected;

FIG. 2 is a perspective plan view of the embodiment of FIG. 1 with thesupply conduit removed;

FIG. 3 is a vertical section transverse to the longitudinal direction ofthe supply conduit through part of the embodiment illustrated in FIG. 1;

FIG. 4 is an illustration as per FIG. 3 of the embodiment of FIG. 2;

FIG. 5 is a plan view of the embodiment of FIG. 1;

FIG. 6 is a perspective view of the second structural part of theembodiment of FIG. 1 providing the connection port;

FIG. 7 is a perspective plan view of another embodiment of anarrangement of the present invention in the applied state with a supplyconduit connected;

FIG. 8 is a perspective plan view of the embodiment of FIG. 7 withoutthe supply conduit;

FIG. 9 is a vertical section in the longitudinal direction of the supplyconduit through the embodiment illustrated in FIG. 7;

FIG. 10 is an illustration as per FIG. 9 of the embodiment of FIG. 8;

FIG. 11 is a vertical section through the embodiment illustrated in FIG.7 in a protective housing;

FIG. 12 is a vertical section through the embodiment illustrated in FIG.7 directly prior to application or use;

FIG. 13 is a perspective plan view of another embodiment of anarrangement in accordance with the present invention in the appliedstate with a supply conduit connected;

FIG. 14 is a side elevation of the embodiment of FIG. 13, including ofthe connecting device of the supply conduit;

FIG. 15 is a vertical section in the longitudinal direction of thesupply conduit through the embodiment illustrated in FIG. 13;

FIG. 16 is a perspective plan view of another embodiment of anarrangement in accordance with the present invention in the appliedstate with a connected supply conduit;

FIG. 17 is a perspective plan view of the embodiment of FIG. 16 withoutthe supply conduit;

FIG. 18 is a vertical section in the longitudinal direction of thesupply conduit through the embodiment illustrated in FIG. 16;

FIG. 19 is a perspective plan view of another embodiment of the presentinvention in the applied state with a connected supply conduit;

FIG. 20 is a vertical section in the longitudinal direction of thesupply conduit through the embodiment illustrated in FIG. 19;

FIG. 21 is a perspective plan view of another embodiment of the presentinvention in the applied state;

FIG. 22 is a plan view of the embodiment of FIG. 21;

FIG. 23 is a side elevation of the embodiment of FIG. 21;

FIG. 24 is a vertical section transverse to the direction of coupling ofthe supply conduit through the embodiment illustrated in FIG. 21; and

FIG. 25 is a perspective view of the first structural part of theembodiment of FIG. 21, including part of the detent means.

DETAILED DESCRIPTION

With regard to fastening, mounting, attaching or connecting componentsof the present invention, unless specifically described otherwise,conventional mechanical fasteners and methods may be used. Otherappropriate fastening or attachment methods include adhesives, weldingand soldering, the latter particularly with regard to the electricalsystem of the invention, if any. In embodiments with electrical featuresor components, suitable electrical components and circuitry, wires,wireless components, chips, boards, microprocessors, inputs, outputs,displays, control components, etc. may be used. Generally, unlessotherwise indicated, the materials for making the invention and/or itscomponents may be selected from appropriate materials such as metal,metallic alloys, ceramics, plastics, etc.

A first preferred embodiment of the inventive arrangement of the presentinvention (which, in addition to being termed an arrangement, also maybe thought of and/or referred to as a system, device, infusionapparatus, infusion set or system) is illustrated in FIGS. 1 and 2 in aperspective plan view, in FIGS. 3 and 4 selectively in the longitudinalsection and in FIG. 5 in plan view. This embodiment, in the form of aninfusion set, is shown with a coupled supply conduit for an infusionliquid (FIGS. 1, 3 and 5) and also without the supply conduit (FIGS. 2and 4). The infusion set comprises a first structural part 1, whichbears or carries on its underside a vertically projecting cannula (notshown). The underside of the first structural part 1 is formed byplaster 12, the adhesive surface of which is covered by protectiveplaster paper 13. A second structural part 3 is inseparably connected tothe first structural part 1, and can be rotated about a vertical axis ofrotation R which runs or extends in the longitudinal axis of thecannula. The second structural part 3 forms a connection port 4 for theconnector 5 of the supply conduit 6 and cooperates with the firststructural part 1 such that the structural parts, in every rotatoryrelative position which they can assume relative to one another, form achannel sealed to the exterior (not shown) for delivering the infusionliquid from the connection port 4 to the cannula. For the innerstructure of the infusion set (not shown here), e.g. with respect to theway in which the channel is formed between the cannula and theconnection port 4 by the first 1 and the second structural part 3 andhow the cannula is connected to the first structural part 1, referenceis also made to the following embodiments, in which structures are shownin detail and are also suited for this first preferred embodiment.

With reference to FIGS. 3, 4 and 6, the second structural part 3 has onthe topside of its outermost radial periphery upwardly aligned teeth 14.In the absence of a corresponding connector 5 for coupling the supplyconduit 6 to the connection port 4, the teeth 14 engage resiliently incorresponding, opposing teeth 15 under the effect of a spring forcegenerated by the second structural part 3. When the supply conduit isnot connected, the spring force overrides the twisting capacity of bothstructural parts 1, 3 relative to one another (see FIG. 4). If thesupply conduit 6 with its connector 5 is coupled to the connection port4 of the second structural part 3, in that the retaining arms 16 of theconnector are moved towards one another, e.g. by exerting pressure withthe thumb and index finger, under elastic deformation of the same, theconnector 5 is set on the connection port 4 at the same time in adirection vertical to the axis of rotation R of both structural parts 1,3 or respectively to the longitudinal axis of the cannula. If theretaining arms 16 are then released again, whereby they are moved awayagain from one another and come up against stop cams 17 on the secondstructural part 3 under spring preload, the second structural part 3 isbulged or urged downwardly by the spring force of the retaining arms 16in the vicinity of its external radial periphery, whereby its teeth 14disengage from the teeth 15 of the first structural part 1 and thestructural parts 1, 3 can be rotated against one another. At the sametime, when viewed in the direction of coupling of the connector 5, theretaining arms 16 catch behind the stop cams 17, making unintentionalwithdrawal of the connector 5 from the connection port 4 impossible. Ifthe connector 5 is uncoupled from the infusion set by renewedcompression of its retaining arms 16 and simultaneous motion of the sameagainst the direction of coupling, the second structural part 3 bulges,is urged or moves upwardly again in the vicinity of its external radialperiphery until its teeth 14 engage resiliently in the teeth 15 of thefirst structural part 1, thus latching both structural parts 1, 3 in theposition assumed.

FIGS. 7 to 10 show, in perspective plan views and in longitudinalsections, a second embodiment of the inventive arrangement of thepresent invention in the form of an applied infusion set, andspecifically with coupled supply conduit (FIGS. 7 and 9) and without asupply conduit (FIGS. 8 and 10). The infusion set again has a firststructural part 1 which bears on its underside a vertically projectingcannula 2 made of flexible material. Arranged on the topside of thefirst structural part 1 is a second structural part 3 which forms aconnection port 4 for coupling a corresponding connector 5 of a supplyconduit 6 for infusion liquid. The first 1 and the second structuralpart 3 are inseparable and are connected together rotatably relative toone another about a vertical axis of rotation R, whereby the axis ofrotation R is identical to the longitudinal axis of the cannula 2. Ineach rotatory relative position which they can take up relative to oneanother, the first and second parts form a liquid-tight channel 7 fordelivering infusion liquid from the connection port 4 to the cannula 2.As is evident from FIGS. 9 and 10, the channel 7 on the connection portside is delimited or defined in part by a first septum 18 which acts asliquid-tight coupling of the supply conduit 6, in that it is piercedthrough during coupling of the connector 5 by a delivery cannula (notshown here, however see FIGS. 15 and 18 of the following exemplaryembodiments) arranged in the former.

Liquid-tight transition between the first 1 and the second structuralpart 3 is effected by a second septum 19 provided by the firststructural part 1 and penetrated by a cannula extension 20 of the secondstructural part 3, extending in the axis of rotation R of the structuralparts 1, 3. As is evident from FIGS. 11 and 12, which show verticalsections through the arrangement illustrated in FIG. 7, prior toapplication the arrangement may be in a special protective housing 23 a,23 b, and the channel 7 is blocked or sealed directly opposite the inletaperture of the cannula 2 and in straight-line extension of the cannulachannel by another septum 21 which forms part of the topside of thesecond structural part 3 and is penetrated in the original state by aguide needle 11. This guide needle 11 supports the cannula 2 duringapplication of the infusion set by inserting the cannula 2 into the bodyof a patient and after application is withdrawn using a reset element 22arranged at its external end from the cannula channel and the otherseptum 21 and removed from the infusion set.

The protective housing 23 a, 23 b is formed from two housing halves 23a, 23 b which, based on the original situation illustrated in FIG. 11,in which the infusion set is marketed and in which it is arrangedprotected inside the housing 23 a, 23 b, can be telescoped. The firststructural part 1 of this embodiment is formed by a circular plateelement 26 and a central body 27 bearing the cannula 2 and connected tothe second structural part 3, whereby the plate element 26 and thecentral body 27 are configured to pivot relative to one another. Bothhousing halves 23 a, 23 b have guides, via which, during telescoping ofthe same, the central body 27 is pivoted with the second structural part3 arranged thereon and the cannula 2 pierced through by the guide needle11, until the cannula 2 pierced through by the guide needle 11 projectsat a right angle from the housing 23 a, 23 b and from the plate element26. In this situation, which is illustrated in FIG. 12, both the twohousing halves 23 a, 23 b and also the plate element 26 and the centralbody 27 snap in undetachably to one another and the housing 23 a, 23 bforms a grip for a user which is grasped for application of the infusionset and by which the guide needle 11 is withdrawn with the reset element22 from the cannula 2 and the other septum 21 and removed from theinfusion set.

As is further evident from FIGS. 7 to 10, the plate element 26 of thefirst structural part 1 has on the peripheral delimiting of its topsideupward aligned teeth 15, in which a projection formed on the undersideof a locking rocker 24 formed by the second structural part 3 engages inthe absence of a corresponding connector 5 for coupling the supplyconduit 6 to the connection port 4 of the second structural part 3.Thus, the twisting capacity or motion of both structural parts 1, 3 toone another when the supply conduit 6 is not connected is overridden orprevented (see FIGS. 8 and 10). If the supply conduit 6 with itsconnector 5 is coupled to the connection port 4 of the second structuralpart 3 by the connector 5 being set on the connection port 4 in adirection vertical to the axis of rotation R of both structural parts 1,3 or respectively to the longitudinal axis of the cannula 2, whereby itsretaining arms 16 latch behind an assigned retainer cam 25 such thatunintentional removal of the connector 5 from the connection port 4 isrendered impossible, the locking rocker 24 is deflected by the connector5. The projection formed on its underside thereby disengages from theteeth 15 of the first structural part 1 and the structural parts 1, 3can be rotated against one another. If the connector 5 is removed again,for which the retaining arms 16 have to be moved toward one by exertionof pressure by the thumb and index finger for disengaging from theretainer cams 25, while the connector 5 is removed against the directionof coupling from the infusion set, the locking rocker 24 tips supportedby spring force back into its previous start position and latches bothstructural parts 1, 3 in the rotatory position relative to one another.

FIGS. 13 to 15 show a third embodiment of an inventive arrangement inaccordance with the present invention in the form of an applied infusionset with connected supply conduit, viewed in perspective plan view (FIG.13), in side elevation from the direction of connection of the supplyconduit (FIG. 14) and in the vertical section in the longitudinaldirection of the supply conduit (FIG. 15). As is evident from thefigures, the infusion set has a first structural part 1, which is formedsubstantially by a circular plate element 26 and a central body 27 whichbears the cannula 2. In the upper region the central body 27 is enclosedby a second structural part 3 in the peripheral sense, which forms aconnection port 4 for coupling a corresponding connector 5 of a supplyconduit 6 for infusion liquid. The first 1 and the second structuralpart 3 are inseparable and are connected to one another rotatablyrelative to one another about a vertical axis of rotation R, whereby theaxis of rotation R is identical to the longitudinal axis of the cannula2.

In each rotatory relative position which they can take up relative toone another, the first 1 and the second structural part 3 form aliquid-tight channel 7 for delivering infusion liquid from theconnection port 4 to the cannula 2. As is evident from FIG. 15 thechannel 7 is delimited on the connection port side by a first septum 18which acts as liquid-tight coupling of the supply conduit 6, in that itis pierced through by a delivery cannula 28 arranged therein when theconnector 5 is coupled. The liquid-tight transition between the first 1and the second structural part 3 is effected by two O-rings 31 spacedapart from one another in the longitudinal direction of the cannula 2,which are borne or carried by the central body 27. Between these O-rings31 the central body 27 has a peripheral groove 29 which is connected viaa radial bore 30 to the cannula entry. The channel 7 is delimiteddirectly opposite the inlet aperture of the cannula 2 and instraight-line extension of the cannula channel by another septum 21which forms part of the topside of the central body 27 of the firststructural part 1 and in the original state is penetrated by a guideneedle (not shown here). This guide needle supports the cannula 2 wheninserted into the body of a patient and after application is withdrawnfrom the cannula channel and the septum 21 and removed from the infusionset.

Referring to FIG. 13, the plate element 26 of the first structural part1 has on its topside six identical, trough-like depressions 32 arrangedevenly spaced generally peripherally, whereof the surface contour has aconstant profile cross-section when viewed in a radial direction. As isevident from FIG. 14, the assigned connector 5 of the supply conduit 6has on its underside a corresponding countercontour and is guided on theconnection port 4 of the second structural part 3 such that it can beset on the connection port 4 and then latches the structural parts 1, 3in a relative position. The connection port 4 is located in the middleabove one of the depressions 32, in that it engages with thecountercontour of its underside in the respective depression 32. In thisembodiment, the first 1 and the second structural part 3 can be latchedin six different rotatory positions relative to one another, wherebycoupling of the connector 5 to the connection port 4 is possible only inone of these relative positions, inevitably resulting in latching of thestructural parts 1, 3 in the relative position. Here, too, the connector5 has retaining arms 16, with which it snaps in behind retainer cams(not shown) when being set on the connection port 4, preventingunintentional removal of the connector 5 from the connection port 4. Thearms have to be moved toward one another for uncoupling the connector 5from the infusion set by exertion of pressure by the thumb and indexfinger, so that the connector 5 can be removed against the direction ofcoupling. As previously described, if the connector 5 is again removedfrom the infusion set both structural parts 1, 3 can be rotated againrelative to one another.

FIGS. 16 to 18 show a fourth embodiment in accordance with the presentinvention in the form of an applied infusion set. The set is shown inperspective plan view with a connected supply conduit (FIG. 16), inperspective plan view without the supply conduit (FIG. 17) and in thevertical section in the longitudinal direction of the connected supplyconduit (FIG. 18). The infusion set shown here has a similarconstruction as that previously described, however with the differencethat here the plate element 26 is designed in one piece with the centralbody 27 and on its topside, instead of the six large depressions alongits peripheral limit, it has a multiplicity of identical smalldepressions 32, arranged evenly spaced in the peripheral sense,resulting in the vicinity of the edge having a corrugated surfacecontour. Likewise in contrast to the previous embodiment, the secondstructural part 3 here has a spring-elastic latching arm 33, which, whenthe supply conduit 6 is not connected to a detent projection 34 formedon its underside, rests on the corrugated surface contour of the plateelement 26 and thus together with the latter forms a ratchet mechanism,the effect of which is that a specific force must be applied to rotatethe second structural part 3 relative to the first structural part 1 andthat these structural parts 1, 3 in each case assume discrete positionsrelative to one another.

If a corresponding connector 5 is set on the connection port 4 of thesecond structural part 3, as shown in FIGS. 16 and 18, the latching arm33 is prevented by the connector 5 from deviating upward and the first 1and the second structural part 3 are latched in their relative position.In this embodiment, the first 1 and the second structural part 3 cantherefore be latched in a multiplicity of discrete positions relative toone another, whereby coupling of the connector 5 to the connection port4 is possible only in one of these relative positions, inevitablyresulting in latching of the structural parts 1, 3 in the relativeposition. When the connector 5 is disconnected, the first 1 and thesecond structural part 3 can be rotated against one another against aforce defined by the previously described ratchet mechanism, wherebythey assume discrete positions relative to one another after a torsionalforce has been overcome. Here, too, the connector 5 has retaining arms16, with which it snaps in behind retainer cams 25 when set on theconnection port 4, rendering unintentional removal of the connector 5from the connection port 4 impossible. The arms have to be moved towardone another to uncouple the connector 5 from the infusion set, so thatthe connector 5 can be removed against the direction of coupling. Theremaining construction of this embodiment, with respect to thestructural design of the seals 18, 21, 31 and the channel 7, correspondssubstantially to the previous embodiment. Those elements not describedexplicitly here, though provided with reference numerals, have the samefunction as the structural parts with corresponding reference numeralsin the previously described designs.

FIGS. 19 and 20 show a fifth embodiment of the present invention in theform of an applied infusion set. The set is shown in perspective planview with a connected supply conduit (FIG. 19) and in the verticalsection in the longitudinal direction of the connected supply conduit(FIG. 20). The infusion set shown here is identical to that previouslydescribed, with the difference that here the latching arm 33 is arrangedat a peripheral position opposite the connection port and, as a result,can also rebound when the supply conduit 6 is connected. In thisembodiment, the second structural part 3 can accordingly always berotated against the force defined by the ratchet mechanism relative tothe first structural part 1, both when the connector 5 is coupled andalso when the connector 5 is removed, whereby the structural parts 1, 3then assume positions relative to one another. Those elements notdescribed explicitly here, though provided with reference numerals, havethe same function as the structural parts with corresponding referencenumerals in the previously described design.

FIGS. 21 to 24 show another embodiment of the present invention in theform of an applied infusion set with a connected supply conduit. The setis shown in perspective plan view (FIG. 21), in plan view (FIG. 22), inside elevation (FIG. 23) and in vertical section in the longitudinaldirection of the connected supply conduit (FIG. 24). The innerconstruction of this embodiment with respect to the structuralconfiguration of the seals 8, 18 and 21 of the channel 7 correspondssubstantially to the second embodiment discussed with reference to FIGS.7 to 10.

As is evident from FIGS. 21 to 24 the infusion set again has a firststructural part 1, which on its underside bears a vertically projectingcannula 2 made of flexible material. On the topside of the firststructural part 1 a second structural part 3 is arranged, and forms aconnection port 4 for coupling a corresponding connector 5 of a supplyconduit 6 for infusion liquid. The first 1 and the second structuralpart 3 are inseparably connected to one another and can be rotatedrelative to one another about a vertical axis of rotation R, whereby theaxis of rotation R is identical to the longitudinal axis of the cannula2. In each rotatory relative position which they can assume relative toone another, the first and second parts form a liquid-tight channel 7for delivering infusion liquid from the connection port 4 to the cannula2. Here, too, the channel 7 is delimited or defined in part on theconnection port side by a first septum 18 which serves as liquid-tightcoupling of the supply conduit 6, in that it is pierced through duringcoupling of the connector 5 by a delivery cannula 28 arranged therein.The liquid-tight transition between the first 1 and the secondstructural part 3 is effected by a rubber seal 8 under compressivestress, which is penetrated by a connection journal 9 of the secondstructural part 3, extending in the axis of rotation R of the structuralparts 1, 3 and which has in its center a bore forming part of thechannel 7. Directly opposite the inlet aperture of the bore of thejournal 9 and in straight-line extension of the cannula channel thechannel 7 is delimited by another septum 21 which forms part of thetopside of the second structural part 3 and in the original state ispenetrated by a guide needle (not shown). This guide needle supports thecannula 2 in application of the infusion set by insertion of the cannula2 into the body of a patient and after application is withdrawn from thecannula channel and the other septum 21 by a reset element arranged onits external end and is removed from the infusion set.

FIG. 25 shows a perspective view of the first structural part 1 togetherwith an actuating element 10 of a latching device. The first structuralpart 1 is formed from a plate element 26, which has circular, radiallyinwardly directed inner cogging 15, and a central body 27 which in thecenter of the plate element 26 projects upwardly therefrom. Arrangedbetween the first 1 and the second structural part 3 in a peripheralposition, lying opposite the connection port 4, is the actuating element10, which is guided radially in the second structural part 3 and ispressed radially outwardly with a spring tab 35 formed by the secondstructural part 3 with spring preload. Thus, it engages withcorresponding counter-cogging (not shown) formed by the latter in theinner cogging 15 of the first structural part 1, thereby preventingrotating of both structural parts 1, 3 in the illustrated situation. Ifa compressive force is exerted on the actuating element 10 inwardly in aradial direction, then it shifts against the spring force of the springtab 35 radially inwardly, whereby the counter-cogging of the actuatingelement 10 is disengaged from the inner cogging 15 and twisting of thesecond structural part 3 relative to the first structural part 1 becomespossible, independently of whether or not a connector 5 is coupled tothe connection port 4. If the actuating element 10 is released it isagain moved radially outwardly by the spring tab 35 until thecounter-cogging of the actuating element 10 engages in the inner cogging15 of the first structural part 1 and latches both structural parts 1, 3in the rotatory relative position. Here also the latching is carried outat discrete positions.

Embodiments of the present invention, including preferred embodiments,have been presented for the purpose of illustration and description.They are not intended to be exhaustive or to limit the invention to theprecise forms and steps disclosed. The embodiments were chosen anddescribed to provide the best illustration of the principles of theinvention and the practical application thereof, and to enable one ofordinary skill in the art to utilize the invention in variousembodiments and with various modifications as are suited to theparticular use contemplated. All such modifications and variations arewithin the scope of the invention as determined by the appended claimswhen interpreted in accordance with the breadth they are fairly,legally, and equitably entitled.

1. An device for introducing a liquid into the body of a patient or forwithdrawing a liquid from the body of a patient, comprising a firststructural part carrying a cannula for positioning in the body of thepatient, and a second structural part with a connection port fordetachably coupling a conduit for supplying or withdrawing the liquid,wherein the first and second structural parts are connected, can berotated relative to each another and in a selected rotational positionform a channel for introducing the liquid from the conduit to thecannula or for withdrawing the liquid from the cannula to the conduit,and wherein movement of the conduit for coupling and uncoupling istransverse to the longitudinal axis of the cannula.
 2. The deviceaccording to claim 1, and a latch operable to releaseably latch thefirst and second parts in the selected position.
 3. An arrangement forintroducing a liquid to the body of a patient or for withdrawing aliquid from the body of a patient, comprising: a first structural partwith a cannula protruding therefrom for arrangement in the body of thepatient; a second structural part with a connection port for detachablecoupling of a connector of a conduit for supplying or withdrawing aliquid, wherein the first structural part and the second structural partare configured and connected to one another such that they areinseparable and can be rotated relative to one another and in everyrelative position form a channel for introducing a liquid from theconnection port to the cannula or for withdrawing a liquid from thecannula to the connection port, and wherein the connection port isdesigned such that the coupling and uncoupling of the connectorassociated with the conduit takes place in a direction transverse to thelongitudinal axis of the cannula.
 4. An arrangement for introducing aliquid to the body of a patient or for withdrawing a liquid from thebody of a patient, comprising: a first structural part with a cannulaprotruding therefrom for arrangement in the body of the patient; asecond structural part with a connection port for detachable coupling ofa connector of a conduit for supplying or withdrawing a liquid, whereinthe first structural part and the second structural part are configuredand connected to one another such that they are rotatable relative toone another and in every relative rotational position form a channel forintroducing a liquid from the connection port to the cannula or forwithdrawing a liquid from the cannula to the connection port, andwherein the connection port is designed such that the coupling anduncoupling of the connector associated with the conduit takes placevertically to the longitudinal axis of the cannula.
 5. The arrangementas claimed in claim 3, wherein the first and the second structural partcan be rotated relative to one another about an axis of rotationextending parallel to the longitudinal axis of the cannula.
 6. Thearrangement as claimed in claim 3, wherein the cannula projectsvertically or non-vertically from a substantially flat outside surfaceof the first structural part and the first and the second structuralpart can be rotated relative to one another by an axis of rotationextending vertically to the surface.
 7. The arrangement as claimed inclaim 3, wherein the first and the second structural part can be rotatedrelative to one another by one of 360° or less than 360°.
 8. Thearrangement as claimed in claim 3, wherein the connection between thefirst and the second structural part is designed such that specifictorque must be overcome for counterrotation of said structural parts. 9.The arrangement according to claim 8, wherein the torque ranges between0.01 and 0.05 Nm.
 10. The arrangement according to claim 8, wherein thetorque ranges between 0.01 and 0.1 Nm.
 11. The arrangement as claimed inclaim 8, further comprising one of a pre-tensed elastic seal or aratchet mechanism for generating the torque.
 12. The arrangement asclaimed in claim 3, further comprising detent means for preventing therotation of the first and second structural part relative to one anotherby latching in a specific position.
 13. The arrangement as claimed inclaim 12, wherein the detent means is configured such that the first andsecond structural part are latched in a position relative to one anotherif no connector of a conduit is coupled to the connection port of thesecond structural part, and wherein the latching can be canceled bycoupling a connector to the connection port.
 14. The arrangement asclaimed in claim 12, wherein the detent means is configured such thatthe first and second structural part are latched in a position relativeto one another if a connector of a conduit is coupled to the connectionport of the second structural part, and wherein that the latching can becanceled by uncoupling of the connector from the connection port. 15.The arrangement as claimed in claim 12, wherein the detent means isconfigured such that it can be activated and deactivated by one or moreactuation elements.
 16. The arrangement as claimed in claim 12, whereinthe detent means is configured such that the latching can take placepositively at discrete positions or frictionally at any position. 17.The arrangement as claimed in claim 3, wherein the cannula is a flexiblecannula and a removable guide needle is forceable through the cannula toenable the cannula to be inserted into the tissue of a patient.
 18. Thearrangement as claimed in claim 17, wherein an outside surface of thefirst structural part from which the cannula extends carries an adhesivelayer for fastening the first structural part to the skin of a patient.19. The arrangement as claimed in claim 3, further comprising anotherconnector for coupling another conduit for supplying or withdrawing aliquid.
 20. A method of delivering a therapeutic substance to a patent,comprising the steps of: providing a device comprising a firststructural part with a cannula extending therefrom for positioning inthe body of the patient, a second structural part with a connection portfor detachably coupling a conduit for carrying the therapeuticsubstance, wherein the first structural part and the second structuralpart are configured and connected to one another such that they areinseparable, can be rotated relative to one another and in a selectedrotational position form a channel for introducing the therapeuticsubstance from the connection port to the cannula, and wherein theconnection port is designed such that the movement of coupling anduncoupling of the conduit takes place in a direction transverse to thelongitudinal axis of the cannula; applying the device to the patient'sbody so that the cannula is positioned in the body; operably coupling asupply of the therapeutic substance to the conduit; and causing thetherapeutic substance to flow into the patient's body.
 21. The method ofclaim 16, wherein the therapeutic substance is insulin.